By Gregory Brill
COM+ is Microsoft's new edition of its COM object-oriented programming framework. outfitted into home windows 2000, this is often an exceptionally strong and intricate know-how that consolidates the beneficial properties of a couple of current Microsoft instruments: OLE, ActiveX, DCOM, Microsoft Message Queue, and Microsoft Transaction Server. via pulling all of those disparate providers into one unified know-how, COM+ carry the promise of higher potency and extra diversified functions for builders who're growing purposes - both firm or advertisement software program - to run on a home windows 2000 procedure. The call for for trustworthy and real-world application-based info on COM+ is massive, and to date vastly exceeds the provision of such documentation.This publication will offer a coherent, unified view of the COM+ structure.
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Extra resources for Applying COM+
39 40 Fortunately, there is the [out,retval] tag. This tag indicates that the argument is really the return value of the function. Add(1,2) Technically, Add() returns an error code, not a data result. What we are seeing is an illusion created by the client-side development environment. So how can we determine if an error occurred? Exceptions. Exceptions are implemented differently in different languages, but they are basically a mechanism that allows errors to be thrown to some form of catcher/handler.
True, your language needed to produce assembly code, and entry points to your functions had to be declared in a certain way so that certain ambiguities were cleared up (who cleans up the call stack, what case will the exported functions be listed in, and so on). That said, however, it quickly became possible to write a DLL in C and call the functions in it from Visual Basic or another language or environment. Now that was power. Today in COM+, DLLs play a more critical and sophisticated role than ever.
COM Internals At this point, those of you developing in Visual Basic and VJ++ have enough basic understanding to move forward into COM+ services and begin the in-depth exploration of these topics. " This section is intended for C++ developers and for VB/VJ++ developers who are interested in seeing COM in its truest form, mainly its C++ implementation. Understanding COM at this level will give you some insight into how COM+ evolved into its present form and why it has the strengths and limitations that it does.